Typewriting-machine



W. F. HELMOND.

TYPEWRITING MACHINE. APPLICATION FILED FEB. 27, 191 9.

1,392,940, Patented 0013. 11, 1921. 2 SHEETS-SHEET I. Q Q *w W. F.HELMOND. TYPEWRITING MACHINE. APPLICATION FILED FEB.27. 1919.

2 SHEETS-SHEET 2.

Patented Oct. 11, 1921;

UNITED STATES PATENT orFicE.

WILLIAM F. HELLEOND, 0F HARTFORD, CONNECTICUT, AS S IGNOR [E0 UNDEBWOODTYPEWRITER COMPANY, OF NEW YORK, N. Y. A CORPORATION OF DELAWARE.

Y EW G-MACHlNE Specification of Letters Zatent.

Patented Oct. 11, 1921.

Application filed February 27, 1919. Serial No. 279,526.

T 0 (M whom it may concern:

Be it known that I, XVILLIAM F. HELMOND, a citizen of the United States,residing in Hartford. in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inTypewriting-lvlachines, of which the following is a specification.

This invention relates to roll mechanism for feeding paper around thecylindrical platens of typewriting machines, and an object of theinvention is to improve and simplify such mechanism to the end that thecost of manufacture is lessened and the parts are more readily assembledand adjusted in the extremely limited space in which these parts must beconfined.

A feature of the invention resides in the compact construction of thepressure-rollsupporting arms and the means associated therewith forregulating the pressure of the rollers against the platen, each armhaving formed as a part of its integral structure a hub whereby it ismounted on a supporting shaft, a roll-supporting member, aspringeng'aging; offset. and a lug engageable by the roll-releasedevices. The springs are of the compact and durable compression helixvariety, and the tension-adjusting means is convenient of access. Alsothe springs exert their action. in an advantageous way ,to'hold therolls against the platen, owing to the fact that each is mountedsubstantially in the plane of the hub which carries the arm to which thespring is related.

Another feature of the invention relates to the simplicity ofconstruction of the lever for controlling the throw-off of the pressurerolls, said lever being formed of a single piece, and so shaped that asubstantial hearing is provided for the pivot thereof. The lever may bestamped out of sheet-metal, thereby saving materially in the cost ofmanufacture. The cost of assembly is also reduced owing to the smallernumber of parts that have to be properly coordinated and securedtogether. To prevent the lever from rattling, a spring is used whichsurrounds the pivot of the lever, the spring bein compressed between thelever and the stud carrying the pivot.

Other features and advantages will hereinafter appear.

In the accompanying drawings, I I I l gure 1 1s a sectlon on the lineA-A of Fig. 2 is a perspective View of the platen 1 Fig. 4 is anelevation of the rolls released. P

Fig. 5 is a plan with the platen removed.

Fig. 6 is a front elevation of the parts shown .in Fig. 5, and, inaddition, showing the release lever and connections.

Fig. holding the pressure rolls against the platen, and showing themeans whereby the tension of the spring is adjusted.

Fig. 8 is a perspective detail of the extreme right-hand roll-supportingarm shown in Fig. 2. I.

Fig. 9 is a perspective detail of the arm immediately to the left ofthat shown in Fig.1. 8.

Fig. 10 is a detail of the support for the throw-off lever.

Fig. 11 is a perspective detail view of the clip for holding thespring-adjusting screw from accidental displacement.

Fig. 12 is a perspective detail of some of the parts shown in Fig. 8.said parts being shown separated so that the details of structure may bemore easily seen.

Fig. 13 is a similar view of some of the parts shown in Fig. 9.

Fig. 14 is a perspective detail of the throw-off lever.

A cylindrical platen 1 is mounted by means of an axle 2 in theends 3 ofthe platen frame. which frame also includes a rear connecting member 4,which supports the paper tabl 5. A shaft '6 also connects the ends 3 of.the platen frame and acts as a tie-rod and also as a supporting meansfor a number of parts which will be hereinafter described.

. The rear pressure or feed rolls 7 are mounted at intervals on a shaft8 extending along the platemsaid shaft being supported by arms 9 whichare mounted for swinging" 7 is a detail view of the spring; for Imovement on the shaft 6. The forward feed 7 In the embodiment shown,there are two arms 9, one at each side of the platen frame, both armsextending rearwardly to support the roll shaft 8. Arms 12extendforwardly and inside of the arms 9, and each of the arms 9 and12may be considered as constituting a pair. For the purpose of holding thepressure or feed rolls against the platen with a yielding pressure,coiled springs 13 are provided, there being one spring for each of thearms 9 and 12, said springs being compressed between lugs carried by theroll-supporting arms and lugs carried by brackets fixedly mounted on theshaft 6.

The arrangement of the arms and the brackets is different for the insideset of arms, that is, the arms 12, from that of the outside set, itbeing an advantage to have the springs close together sothat they may bereadily accessible for adjustment.

Referring to Fig. 8, which shows the extreme right-hand roll-supportingarm 9, said arm is provided with a lug 14 which is bent over toward theleft, as viewed in Figs.

5 and 8. or, in other words. toward the center of the platen frame.Adjacent the right side of said arm is a stationary bracket 15, whichmay be rigidly secured to the shaft 6 by a set screw 16. This bracketcarries a lug 17 projecting therefrom, which lug passes under the arm 9and into such a position that a screw-threaded hole 18 in said lug comesinto alinement with a stud 19 secured to or forming part of the lug 14.Threaded into the hole 18 is a screw 20, the reduced end of said screwengaging a cup or washer 21. The compression spring 13 is held in placeby-the stud 19, and seats against the washer 21. By moving the screw inor out, the tension of the spring may be readily adjusted. To retain thescrew in the position into which it has been set, a spring finger 22 maybe provided, said finger being held between the cup 21 and the lug 17 ofthe bracket,and engaging aflat-sided head on the screw, which head maybe in the form of a lock nut. if desired.

The arm 9 is provided with a hub 23 forming a bearing upon which the armpivots on the shaft 6, and the arm is also provided with adownwardly-projecting lug 24 adapted to engage a depression in thepressureroll release shaft 25, which shaft is rocked by a throw-offlever, the particular construction of which will behereinafterdescribed. It will'be seen that the arm 9 and the lug 24 aresubstantially parts of a flat plate mounted on one end of hub 23 andforming a head therefore The hub and the spring are in substantially thesame vertical plane, so that the pressure of the spring has no tendencyto skew the arm on the shaft which would tend to increase the frictionof the arm during its rocking movement.

The arm 12 immediately adjacent and to theleft of the arm 9, shown inFig. 8, is likewise provided with a hub 25" forming a bearing for thearm. Likewise the arm is provided with a lug 26, which lug has ascrew-threaded hole similar to that in the lug 17. This lug projects tothe left of the plane of the arm as viewed in Figs. 9 and 13, the holein said lug being in alinement with a spring-retaining stud 27 formed ona bracket 28, which bracket may be fastened to the shaft 6 by means of aset screw 29. Spring 13 is compressed between the stud 27 of the lug 30of the bracket 28, and the lug 26' projecting from the arm 12 in thesame manner as has already been described with respect to the arm 9. Thebracket 28 being stationary, the pressure of the spring 13 is exerted tomove the arm 12 in an anti-clockwise direction, while the springconnected to the arm 9 tends to move said arm in a clockwise direction,thereby holding the rolls carried by said arms in yielding contact withthe platen.

The right face of the arm 12. as viewed in Figs. 9 and 13, is in contactwith the hub of the arm 9, the lugs 26 and 30 being in the plane of thehub 25 so that the spring associated with the arm 12 likewise exerts itspressure evenly. The arm 12 has a projecting lug 31 in the same planetherewith, said lug similar to the lug 24, but projecting on theopposite side of the shaft 25 from that of the lug 24, said shaft beingflattened in the region of each of the lugs 24 and 31 so that when saidshaft is rocked both arms are moved downwardly to release the pressurerolls from the platen. The lugs 24 and 31. are in the same verticalplane as the respective arms 9 and 12.

- The left-hand pair of arms differs from the right-hand pair justdescribed, in that the lug 1.4 of the arm 9 projects toward the right,the lug of the corresponding bracket projecting toward the left so as toproperly aline with the stud carried by the lug 14. so as to properlysupport the spring in vertical position. Similarly, the lug 26 of thearm 12 of the left-hand pair of arms extends to the right, as clearlyshown in Fig. 5, the

lug 30 ofits associated bracket extending to theileft.

The release shaft 25 is supported by hangers from the shaft 6, and isprovided at its right hand end with a bent portion to which is fasteneda link 33 secured at its upper endto a member 34 of the throw-off leyer.This throw-off lever is preferably formed of a single piece ofsheet-metal, bent as shown in Fig. 14, and having a member 35 parallelto the member 34, the two members being connected by across-piece 86,member 35 being also provided with a bentover finger-engaging portion37, whereby the lever may be manipulated to throw off the pressurerolls. The members 34 and have alined openings 38 and 39, the opening 38being larger than the opening 39, and adapted to engage over a stud it).A screw 41 is adapted to be passed through the opening 39 and into thestud 40 to hold the lever in place, a spring 412 being provided andbeing of such length that it is compressed between a shoulder e3 of thestud 10 and the inside portion of the lever member when the screw isseated, as will be readily ap parent from Fig. Any slight looseness ofthe parts is taken up by the spring, and consequently there is no rattleof the lever during the operation of the typewriter.

Variations may be resorted to within the scope of the invention, andportions of the improvements may be used without others.

Having thus described my invention, 1 claim:

1 In a typewriting machine, in combination, a platen, front and rearfeed-rolls to cooperate therewith, shafts for said rolls. a supportingbar, supporting arms for said shaft-s, said arms being associated inpairs. each pair including an arm for each of said shafts, the arms ofeach pair having hubs journaled end to end on said supporting bar andextending from said arms in the same direction along said bar, so thatone of said hubs serves to maintain said arms at the desired distanceapart, a lug on each arm extending therefrom in the same direction asthe hub and lying between the planes of its ends, a fixed support pairedwith each of said lugs, and a spring between each lug and its supporttending to move the former relatively to the latter, said springsthereby tending to cause said rolls to be pressed against said platen.

2. 'In a typewriting machine, in combination, a platen, front and rearfeed-rolls to cooperate therewith, shafts for said rolls, a supportingbar, supporting arms for said shafts, said arms being associated inpairs, each pair including an arm for each of said shafts, the arms ofeach pair having hubs journaled end to end on said supporting bar, a lugon each arm, a fined support paired with each of said lugs, a spring between each lug and its support tending to move the former relatively tothe latter, said springs thereby tending to cause said rolls to bepressed against said platen, an operating arm in fixed relation witheach supporting arm, and a feed-roll-releasing device having operatingelements to move said operating arms and thereby cause said feed-rollsto be separated from said platen, each of said supporting arms, itsoperating arm, its spring and the retaining lugs there for lying withinthe planes of the ends of its hub.

3. In a typewriting machine, in combination, a platen, front and rearfeed-rolls to cooperate therewith, shafts for said rolls, a

supporting bar, supporting arms for said shafts, said arms beingassociated in pairs, each pair including an arm for each of said shafts,the arms of each pair having hubs journaled end to end on saidsupporting bar, pairs of sleeves fixed to said supporting bar, thesleeves of each pair being located at opposite ends of the correspondingpair of hubs, so as to constitute end stops therefor, a lug on eacharm,an opposing lug on each sleeve, and a spring between ach pair ofopposing lugs tending to move the arm-supported lug relatively to theother, said springs thereby tending to cause said rolls to be pressedagainst said platen, the hub portions of the arms of each pair beingextended axially in the same direction along saidsuppoiting bar, and thespringretaining lugs carried by said arms being so located as to liewithin the planes of the respective hub-ends.

l. In a typewriting machine, in combinzv tion, a platen, front and rearfeedrolls to moperate therewith, shafts for said rolls, a tupporting barparallel with and equally distant from each shaft, supporting arms forsaid shafts, said arms being associated in pairs, each pair including anarm for each of said shafts, the arms of each pair having hubs journaledend to end on said supporting bar, pairs of sleeves fixed to saidsupporting bar, the sleeves of each pair being located at opposite endsof the corresponding pair of hubs, so as to constitute end stopstherefor, a lug on each arm, an opposing lug on each sleeve, and aspring between each pair of opposing lugs tending to move thearm-supported lug relatively to the other, said lugs and springs beinglocated at the same side of said supporting bar, with the two lugs forthe spring for each pair of arms positioned one above the other, onehaving the arm-supported lug uppermost and the other having thesleevesupported lug uppermost, so that each spring will tend to causeany feed-roll affected thereby to be pressed against saidplaten,

the hub portions of the arms'of each pair being extended axially in thesame direction along said supporting bar, and the spring-retaining lugscarried by said arms being so located as to lie within the planes of therespective hub-ends.

5. In a typewriting machine, in combination, a platen front and rearfeed-rolls to cooperate therewith, shafts for said rolls, a supportingbar, supporting arms for said shafts, said arms being associated inpairs, each pair including an arm for each of said shafts, the arms ofeach pair having hubs journaled end to end on said supporting bar, pairsof sleeves fixed to said supporting bar, the sleeves of each pair beinglocated at opposite ends of the corresponding pair of hubs, so as toconstitute end stops therefor, a

lug on each arm, an opposing lug on each sleeve, a spring between eachpair of opposing lugs tending to move the arm-supported lug relativelyto the other, said springs thereby tending to cause said rolls to bepressed against said platen, an operating arm in fixed relation witheach supporting arm, and a. feed-roll-releasing device having operatingelements to move said operating arms and thereby cause said feed-rollsto be separated from said platen, each of said supporting arms, itsoperating arm, its spring and the retaining lugs therefor lying withinthe planes of the ends of its hub.

6. A typewriter feed-roll-supporting element comprising a hub and aplate-like head at one end thereof comprising a supporting arm extendingradially from the hub, an operating arm extending radially therefrom ata different angle to enable the edge of the operating arm to be engagedby an actuating member, and a spring-retaining lug extending from theside of said head from which said hub projects, said arms and said luglying wholly within the planes of the ends of said hub.

7. A typewriter feed-roll-mounting comprising, in combination, a rockerarm having a lug thereon, a fixed support having an opposing lugthereon, a pair of opposed springretaining elements, one for each ofsaid lugs, an adjustable mounting means for one of said spring-retainingelements comprising an adjusting screw threaded through its supportinglug, said screw having at its inner end a reduced portion and anintermediate shoulder, and having a polygonal head at its outer end, theadjustably-mounted spring-retaining element having an opening to engagethe reduced end of said screw, a spring confined between said opposedretaining elements, and a spring-clip to prevent accidental rotation ofsaid adjusting screw, said clip comprising a base portion engaging thereduced end thereof between said shoulder and the adjacentspring-retaining element, a spring-finger to yieldingly engage thesurface of said polygonal screw-head,

and a connecting portion in snug engagement with a surface of said lug,so as to permit endwise movement of said clip with said screw duringadjustment, but preventing movement thereof about its axis.

8. In a typewriter feed-ro-ll-release mechanism, in combination, asupporting stud having a reduced end portion and an intermediateshoulder, a one-piece lever having spaced bearing portions, saidportions being perforated, one to fit the body portion of said stud, andthe other to fit the reduced end portion, a fastening member secured atthe end of the reduced end portion of said stud to retain said leverthereon, and a spring coiled about the reduced end portion of said studwith its ends confined between said shoulder and the bearing portion ofsaid lever perforated to fit the reduced end portion of said stud.

9. In a typewriting machine, in combination, a platen-frame comprisingan end hav ing an outwardlyextending flange, a supporting stud attachedto said end beneath the flange, said stud having a substantiallycylindrical body portion, and a substantially cylindrical end portion ofreduced cross-section extending beyond the edge of said flange, aone-piece lever having spaced bearing portions, one being perforated tofit the body portion of the stud and the other to fit the reduced endportion, said lever also being provided with an arm for manual operationextending from the bearing adapted to fit the reduced end portionsacross said flange, a helical spring on the reduced portion of said studand normally compressed between the shoulder formed by the body portionof the stud, and the outer bearing portion of said lever, and means atthe outer end of said reduced portion to engage the adjacent bearingportion of the lever and hold it on the reduced portion of the stud.

\VILLIAM F. HELMOND.

lVitnesses JOHN J. BASKERVILLE, FRANK LowE.

